Attachment 150521 Details for Bug 195918 – bin/sh with debug enabled and check for negative value

bin/sh with debug enabled and check for negative value

gdb-patched-varisset.txt (text/plain), 1.90 KB, created by Jason Unovitch on 2014-12-13 01:17:58 UTC

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Creator: Jason Unovitch

Created: 2014-12-13 01:17:58 UTC

Size: 1.90 KB

patch

obsolete

>Breakpoint 1 at 0x408fb0: file expand.c, line 863.
>Starting program: /usr/src/bin/sh/sh 
>
>Breakpoint 1, varisset (name=0x8015a7234 "1985234857347568347:1=2:5ù", 
>    nulok=16) at expand.c:863
>863		if (*name == '!')
>861	{
>863		if (*name == '!')
>865		else if (*name == '@' || *name == '*') {
>877		} else if (is_digit(*name)) {
>879			int num = atoi(name);
>881			if (num > shellparam.nparam)
>883			if (num < 0)
>$1 = -1544760613
>$2 = -1544760613
>895	}
>varisset (name=0xa <Error reading address 0xa: Bad address>, nulok=-858993460)
>    at expand.c:891
>891			if (nulok && (ap == NULL || *ap == '\0'))
>895	}
>evalvar (p=0x8015a724a "2:5ù", flag=3) at expand.c:703
>703		startloc = expdest - stackblock();
>692			set = varisset(var, varflags & VSNUL);
>703		startloc = expdest - stackblock();
>704		if (!set && uflag && *var != '@' && *var != '*') {
>703		startloc = expdest - stackblock();
>704		if (!set && uflag && *var != '@' && *var != '*') {
>712				error("%.*s: parameter not set", (int)(p - var - 1),
>716		if (set && subtype != VSPLUS) {
>718			if (special) {
>719				varvalue(var, varflags & VSQUOTE, subtype, flag);
>720				if (subtype == VSLENGTH) {
>745						STPUTS(val, expdest);
>751		if (subtype == VSPLUS)
>752			set = ! set;
>754		easy = ((varflags & VSQUOTE) == 0 ||
>758		switch (subtype) {
>824			c = p - var - 1;
>825			error("${%.*s%s}: Bad substitution", c, var,
>Warning:
>Cannot insert breakpoint -12.
>Error accessing memory address 0x7325732a2e257b24: Bad address.
>
>Single stepping until exit from function _longjmp, 
>which has no line number information.
>main (argc=1, argv=0x7fffffffdbd0) at main.c:105
>105			switch (exception) {
>111				exitstatus = 2;
>118			if (state == 0 || iflag == 0 || ! rootshell ||
>121			reset();
>122			if (exception == EXINT)
>124			popstackmark(&smark);
>125			FORCEINTON;				/* enable interrupts */
>126			if (state == 1)
>128			else if (state == 2)
>130			else if (state == 3)
>175			cmdloop(1);
>
>Program exited with code 0205.

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